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<table width="100%" summary="page for eagles"><tr><td>eagles</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>
Foraging Ecology of Bald Eagles
</h2>

<h3>Description</h3>

<p>Knight and Skagen collected during a field study on the foraging
behaviour of wintering Bald Eagles in Washington State, USA data
concerning 160 attempts by one (pirating) Bald Eagle to steal a chum
salmon from another (feeding) Bald Eagle.
</p>


<h3>Usage</h3>

<pre>
eagles
</pre>


<h3>Format</h3>

<p>The <code>eagles</code> data frame has 8 rows and 5 columns.
</p>

<dl>
<dt><code>y</code></dt><dd>
<p>Number of successful attempts.
</p>
</dd>
<dt><code>n</code></dt><dd>
<p>Total number of attempts.
</p>
</dd>
<dt><code>P</code></dt><dd>
<p>Size of pirating eagle (<code>L</code> = large, <code>S</code> = small).
</p>
</dd>
<dt><code>A</code></dt><dd>
<p>Age of pirating eagle (<code>I</code> = immature, <code>A</code> = adult).
</p>
</dd>
<dt><code>V</code></dt><dd>
<p>Size of victim eagle (<code>L</code> = large, <code>S</code> = small).
</p>
</dd>
</dl>



<h3>Source</h3>

<p>Knight, R. L. and Skagen, S. K. (1988)
Agonistic asymmetries and the foraging ecology of Bald Eagles.
<em>Ecology</em> <b>69</b>, 1188&ndash;1194.
</p>


<h3>References</h3>

<p>Venables, W. N. and Ripley, B. D. (1999)
<em>Modern Applied Statistics with S-PLUS.</em> Third
Edition. Springer.
</p>


<h3>Examples</h3>

<pre>
eagles.glm &lt;- glm(cbind(y, n - y) ~ P*A + V, data = eagles,
                  family = binomial)
dropterm(eagles.glm)
prof &lt;- profile(eagles.glm)
plot(prof)
pairs(prof)
</pre>


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